I am trying to submit a new app for review. Part of the process requests that I submit images of the app in different formats: 5.5" iPhone, 12.5" iPad, etc. I used the Xcode simulator to create the required views then used Shift, Command, 4 and Space bar to capture the different image. When I tried to drag these images onto the page, a message told me that my images were the wrong size.
I need from you is a step-by-step procedure as to how to generate the correct image for any one of the correct devices.